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Strange Assert in setTo

asked 2012-11-30 05:08:10 -0500

Jeff gravatar image

Hi there,

I was doing some basic image processing and I used a Mat of type CV_8UC3 as a mask. Apparently this is incorrect, so the program failed on a OpenCV assert. So far no problem, just my misinterpretation.

But here's the issue: I read the assert to find out what I did wrong, and it has a strange comparison: mask.empty() || mask.type() == CV_8U

The type of the mask is compared to a depth... Although the comparison is equivalent to mask.type() == CV_8UC1, it's confusing for a simple user...

So my question is: is this a bug? Should I report it?

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answered 2012-12-03 15:08:12 -0500

AlexanderShishkov gravatar image

It is not a bug, because CV_8U = CV_8UC1=0, but it leads to misinterpretation. You should report about this problem on our bug tracker (

But the best way is to create pull request with fix for this problem.

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answered 2012-11-30 05:23:02 -0500

wl2776 gravatar image

Looks like a bug. Report, of course.

According to reference manual (opencv2refman.pdf, page 35), values like CV_8U or CV_8S, or CV_16U, etc, are returned from Mat::depth().

Mat::type() returns a constant, having number of channels, like CV_8UC3

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Asked: 2012-11-30 05:08:10 -0500

Seen: 400 times

Last updated: Dec 03 '12